This Seeking Tech guide will explain how you can unlock the Must Have Been the Ghosts trophy in Sly Cooper and the Thievius Raccoonus (2024) on PS4 and PS5.
You can use the following video as a reference:
You then need to defeat all the guards without getting detected. To do so, stay away from the flashlights and attack them from behind. Try not to get too close as you may end up alerting them.
Use the rewind feature if you messed up.
Once you defeat all of the wandering guards, take out the last standing guard to unlock this trophy.